# std::experimental::erase_if (std::multiset)

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< cpp‎ | experimental

Defined in header `<experimental/set>` |  |
template< class Key, class Compare, class Alloc, class Pred > void erase_if( std::multiset<Key, Compare, Alloc>& c, Pred pred ); |  | (library fundamentals TS v2)

Erases all elements that satisfy the predicate pred from the container. Equivalent to

    for (auto i = c.begin(), last = c.end(); i != last;)
    {
        if (pred(*i))
            i = c.erase(i);
        else
            ++i;
    }

### Parameters

c | - | container from which to erase
pred | - | predicate that determines which elements should be erased

### Complexity

Linear.

### Example

Run this code

    #include <experimental/set>
    #include <iostream>

    template<typename Os, typename Container>
    inline Os& operator<<(Os& os, Container const& container)
    {
        os << "{ ";
        for (const auto& item : container)
            os << item << ' ';
        return os << '}';
    }

    int main()
    {
        std::multiset<int> data{3, 3, 4, 5, 5, 6, 6, 7, 2, 1, 0};
        std::cout << "Original:\n" << data << '\n';
        auto divisible_by_3 = [](auto const& x) { return (x % 3) == 0; };
        std::experimental::erase_if(data, divisible_by_3);
        std::cout << "Erase all items divisible by 3:\n" << data << '\n';
    }

Output:

    Original:
    { 0 1 2 3 3 4 5 5 6 6 7 }
    Erase all items divisible by 3:
    { 1 2 4 5 5 7 }

### See also

removeremove_if | removes elements satisfying specific criteria (function template)

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